Initial investigation of a novel light-scattering gel phantom for evaluation of optical CT scanners for radiotherapy gel dosimetry
Initial investigation of a novel light-scattering gel phantom for evaluation of optical CT scanners for radiotherapy gel dosimetry
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DOI：
10.1088/0031-9155/52/10/017
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发表时间：
2007-05-21
影响因子：
3.5
通讯作者：
Baldock, Clive
中科院分区：
文献类型：
--
作者：
Bosi, Stephen;Naseri, Pourandokht;Baldock, Clive
需要用于验证与辐射诱导聚合凝胶剂量计结合使用的光学计算机断层扫描 (CT) 扫描仪的模型的稳定凝胶材料。已采用基于在明胶中添加光吸收染料来模拟凝胶剂量计的模型。然而，为了更准确地模拟聚合凝胶，需要使用添加到凝胶中的光散射胶体悬浮液的模型。在本文中，我们介绍了使用光学 CT 扫描仪评估一种新型模型的初步结果，其中通过添加不同浊度的胶体悬浮液来模拟暴露于辐射的聚合物凝胶。该体模可用作聚合物凝胶剂量计的校准传递标准。测试揭示了光散射凝胶特有的一些现象，在校准聚合物凝胶剂量计时需要考虑这些现象。
There is a need for stable gel materials for phantoms used to validate optical computerized tomography (CT) scanners used in conjunction with radiation-induced polymerizing gel dosimeters. Phantoms based on addition of light-absorbing dyes to gelatine to simulate gel dosimeters have been employed. However, to more accurately simulate polymerizing gels one requires phantoms that employ light-scattering colloidal suspensions added to the gel. In this paper, we present the initial results of using an optical CT scanner to evaluate a novel phantom in which radiation-exposed polymer gels are simulated by the addition of colloidal suspensions of varying turbidity. The phantom may be useful as a calibration transfer standard for polymer gel dosimeters. The tests reveal some phenomena peculiar to light-scattering gels that need to be taken into account when calibrating polymer gel dosimeters.